Gravitational wave from extreme mass-ratio inspirals as a probe of extra dimensions

Abstract

The field of gravitational waves is rapidly progressing due to the noticeable advancements in the sensitivity of gravitational-wave detectors that has enabled the detection prospects of binary black hole mergers. Extreme mass-ratio inspiral (EMRI) is one of the most compelling and captivating binary systems in this direction, with the detection possibility by the future space-based gravitational wave detector. In this article, we consider an EMRI system where the primary or the central object is a spherically symmetric static braneworld black hole that carries a tidal charge Q. We estimate the effect of the tidal charge on total gravitational wave flux and orbital phase due to a non-spinning secondary inspiralling the primary. We further highlight the observational implications of the tidal charge in EMRI waveforms. We show that LISA (Laser Interferometer Space Antenna) observations can put a much stronger constraint on this parameter than black hole shadow and ground-based gravitational wave observations, which can potentially probe the existence of extra dimensions.

Prospects of detecting deviations to Kerr geometry with radiation reaction effects in EMRIs

“…As the name suggests, such binaries have a mass ratio lying in the range (q ≡ µ/M = 10 −7 − 10 −4 ) and radiate GWs in the millihertz range, making it one of the most sought-after objects in LISA [75]. Much work has been done to look for theoretically modelling such signals [76][77][78][79][80][81][82][83][84][85][86][87][88] in the hope that they will infer the dynamics of the compact object deep in the gravitational field of the central black hole. It allows us to probe intergalactic astrophysical environment [89] and also place constraints for both modelling and data analysis of EMRIs.…”

Asymptotically locally flat and AdS higher-dimensional black holes of Einstein–Horndeski–Maxwell gravity in the light of EHT observations: shadow behavior and deflection angle

“…There are some traces of extra dimensions in the detection of GW, possessing certain information about the associate amplitude and the dynamics of fluctuation modes. Hence, many works have been focused on revealing such physics [65][66][67][68][69] and for a detailed review, see Ref. [70].…”

Non-local tails in radiation in odd dimensions

“…Recently, actively developing gravitational-wave astronomy opens up new ways for the experimental study of extra dimensions (for review see, e.g., [14,15]). Extra dimensions can manifest themselves in gravitational-wave signals in the number of ways: as additional polarisations of gravitational waves [16][17][18], tower of massive highfrequency Kaluza-Klein modes of gravitational waves [16,19], additional contributions to the source of gravitational field [20][21][22][23], differences between the propagation of gravitational and counterpart electromagnetic signals [24][25][26][27], leakage of gravitational waves into extra dimensions [28][29][30][31][32], signal modifications due to the tidal charges of black holes [33,34], as well as the modifications of quasi-normal modes [35,36] and tidal deformabilities of black holes and neutron stars [37][38][39]. Also, it is worth noting here another powerful tool to probe extra dimensions -the photographs of black hole shadows [40][41][42][43].…”